DE DIETRICH VIVADENS MCR 24_28 BIC - Manual (Page 11)

The display indicates the state of the boiler and any errors. The
symbols located above the function keys indicate their current
function.
Pressing on any key will display the current status of the boiler and
the current command code. If there is a fault, the corresponding code
continues to be displayed.
MCR 24/28 BIC 3. Description
170513 - 300024112-001-01 10